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Experimental and Theoretical Studies of Unevenly Designed 4-bladed Inducers

不均匀设计的四叶导流轮的实验和理论研究

基本信息

批准号：
08555047
负责人：
TSUJIMOTO Yoshinobu
金额：
$ 1.66万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08555047/
关键词：
Rocket Engine Inducer Cavitation Uneven Blades Alternate Blade Cavitation Rotating Cavitation Surge Synchronous Shaft Vibration 気泡流位相ドップラー法

项目摘要

Owing to the successful development of the H-II Rocket, Japan has caught up with the U.S.A.and Europe in terms of the technology of aerospace engineering. Rotating cavitation, however, was observed in the development stage of the turbopump inducers for H-II,ARIANE V and Space Shuttle. So, the rotating cavitation has been a common problem all over the world. Under such conditions, inducers should be designed by taking into account the higher suction performance but also the suppression of the rotating cavitation. In this study, we manufactured unevenly designed 4-bladed inducers and investigated the effective ways to suppress or avoid the rotating cavitation both theoretically and experimentally.(1) Both the alternate blade cavitation and rotating cavitation were analyzed theoretically. By a steady analysis, it was found that both even length cavitation and alternate blade cavitation do exist in some range of cavitation number. In such a case, it was also found by a stability analysis t … More hat the alternate blade cavitation is more stable than even length cavitation. Moreover, these analyzes were extended for the case of unevenly designed 4-bladed inducers, and the stabilities of rotating cavitation and alternate blade cavitation were examined.(2)A 4-bladed inducer was manufactured along the same guideline with the designment of 3-bladed inducer for LE-7. Another 4-bladed inducer, which has no swept back, was also manufactured to examine the effect of swept back through the comparison of experiments. Moreover, an inducer with slightly swepted blades at 1 blade intervals, which were modified from the inducer without swept back, was tested. It was found that the swept back has an effect on the suppression of both rotating cavitation and alternate blade cavitation.(3) Non-linear behavior was investigated by chaotic analysis of inlet pressure fluctuation, whereas theoretical analyzes in (1) were based on linear analyzes, and mainlyFourier analysis was used in experiments in (2). We herein investigated the possibility to derive the information about the unsteady cavitation by the observation of attracters in the phase portrait. Less

由于H-II火箭的成功开发，日本在航空航天工程技术方面已经赶上了美国和欧洲。然而，在H-II、阿丽亚娜五号和航天飞机涡轮泵诱导器的研制阶段就观察到了旋转空化现象。因此，旋转空化问题已成为世界各国普遍存在的问题。在这种情况下，诱导轮的设计应考虑到更高的吸气性能，但也抑制旋转空化。本研究制作了非均匀设计的四叶片诱导轮，并从理论和实验两方面研究了抑制或避免旋转空化的有效方法。(1)对交替叶片空化和旋转叶片空化进行了理论分析。通过定常分析发现，在一定的空化数范围内，均长空化和交错叶片空化都存在。在这种情况下，通过稳定性分析也发现， ...更多信息交替叶片空化比等长叶片空化更稳定。此外，这些分析扩展到不均匀设计的四叶诱导轮的情况下，旋转空化和交替叶片空化的稳定性进行了检查。(2)A四叶诱导轮是按照与LE-7的三叶诱导轮设计相同的指导原则沿着制造的。为了验证后掠对诱导轮性能的影响，还设计了一种无后掠的四叶诱导轮。此外，还对一种在无后掠诱导轮的基础上改进而成的、叶片间距为1的、叶片略后掠的诱导轮进行了试验。结果表明，后掠对旋转空化和交替叶片空化都有抑制作用。(3)通过对进气压力脉动的混沌分析研究了进气压力脉动的非线性行为，而（1）中的理论分析是基于线性分析，（2）中的实验主要采用傅立叶分析。本文研究了通过观察相图中的吸引子来获取非定常空化信息的可能性。少